<html>
<head>
<script type="text/javascript" src="../shiro/manager/jquery-1.10.2.min.js"></script>
</head>
<body>
<div>
	<div>
		<div id="a1">a1</div>
		<div>a2</div>
	</div>
	<div>
		<div>a3</div>
		<div>a4</div>
	</div>
</div>
</body>
<script type="text/javascript">
var v = $("#a1").parent();
v.css("background-color", "gray");
</script>
</html>